That what I figured. You will probably just have to wait till you come across a used one. I see them everyonce in a while on Ebay (whole truck) and somebody else just posted they picked one up recently. They are out there but you will need luck on your side. I have been looking for a flex-thru window since 85, have only seen one and the jerk (lived 2 blocks from me) wouldn't part with it. I offered him $100 (they were about $85 new) plus my old window and I would do all the install. The truck was a total beater, I should have just did a midnight auto run on it!!
For those that don't know, a flex-thru was a rear window that opened on the sides by the doors kind of like the way a sunroof opens. If any of you know of where I can locate one of these, PLEASE LMK!!!!!! Thanks